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Finding the Fourth Proportional to 390,058.65, 538,281.68 and 217,976.61

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Solution

The fourth proportional to 390,058.65, 538,281.68 and 217,976.61 is: 300,808.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,058.65 : 538,281.68 = 217,976.61 : x
  2. Step 2: Convert to fraction form
    390,058.65/538,281.68 = 217,976.61/x
  3. Step 3: Cross multiply
    390,058.65x = 538,281.68 × 217,976.61
  4. Step 4: Simplify right side
    390,058.65x = 117,332,814,741.62
  5. Step 5: Solve for x
    x = 117,332,814,741.62/390,058.65
  6. Step 6: Final answer
    x = 300,808.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.